AT+ Diagnosis

AT+ thrives to insure that every child presenting with developmental difficulties has access to an in depth diagnostic evaluation.

Medical Issues in ASD

Contact Us

Autism Treatment Plus
t: 07555 744235 (admin)
Out of hours: 075 90 69 87 80

The diagnostic assessment provided at AT+ is based on several standardised diagnostic protocols designed to identify individuals with an Autism Spectrum Disorder (ASD). They include the SCQ (Social Communication Questionnaire) to measure the current and /or past presentations of an Autism Spectrum Disorder, the Gillian Autism Rating Scale-Second Edition, (GARS-2), the Social Responsiveness Scale (SRS-2) which takes into account the new DSM-5 diagnostic criteria, the Sensory Processing Measure (SMP), the Pervasive Developmental Disorders Behaviour Inventory (PDD-BI), Vinland Adaptive Behaviour Scale Second Edition to measure the child or adult’s skills across all developmental domains,  and the Autism Diagnostic Observational Schedule (ADOS)- 2. We also use the Autism Diagnosis Interview Revised (ADI-R). To read more about these instruments, visit our Training web site here.

Description of the two main diagnostic instruments:

ADOS-2 assessment is a semi-structured standardised assessment designed to assist in the diagnosis of autism spectrum disorders. The tool allows the evaluation of a person’s communication, social interaction, play and imaginative use of material under set contingencies. There are 5 modules available, based on the person’s age and level of communication, from toddler to adult age. Each module takes 30-45 minutes to administer. As the module level increases, the assessments include progressively more challenging tasks, in order to highlight the autistic features the person may have. This is achieved through planned social occasions, referred as “presses”, in which the behaviour of a particular type is more likely to occur. The assessment is very detailed and includes a large range of verbal and non-verbal communication and language skills as well as behaviours.

Quick Facts

Administer To Individuals from toddlers (age 2) to adults
Completion Time 30-45 min
Formats Semi-structured assessment- Ideally video recorded.
Scoring Options Hand scoring (immediately after the session and/or on video recording depending on study design).
Norms 566+ children and adults.
Others Training and regular consensus meetings required



The Autism Diagnosis Interview- Revised (ADI-R) is an interview evaluation of individuals with a suspected autism spectrum disorder used as an aid to formal diagnosis. The tool has proven effectiveness in differentiating autism from other developmental disorders, assessing syndrome boundaries, identifying new sub-groups and quantifying autistic symptomatology.

The interview covers 93 items grouped into three functional domains:

* Language and Communication
* Reciprocal Social Interactions
* Restricted Repetitive and Stereotyped Behaviours and Interests

and covers eight content areas:

* The subject’s background including family, education, previous diagnoses and medication
* Overview of the subjects behaviour
* Early development and development milestones
* Language acquisition and loss of language or other skills
* Current functioning in regard to language and communication
* Social development and play
* Interests and behaviours

Clinically relevant behaviours such as aggression, self injury and possible epileptic features.

To administer ADI-R, an experienced clinical interviewer questions a parent or caregiver who is familiar with the developmental history and current behaviour of the individual being evaluated.

Results are scored and interpreted using a Diagnostic Algorithm or a Current Behaviour Algorithm or both depending on the purpose of the evaluation.

Quick Facts

Administer To Family or carergiver familiar with the individual developmental history and individual concerned
Age range 4 years old and older
Completion Time 90-160min
Formats Interview-based questionnaire
Scoring Options Hand Scoring/
Others Training required